Abstract
Paramylon, a water-insoluble euglenoid polysaccharide, was functionalized with glycidyltrimethylammonium chloride to obtain 2-hydroxy-3-trimethylammoniopropyl paramylons (HTAPs) with varying degrees of substitution to render them soluble in various organic solvents. The HTAPs were then utilized in the preparation of films. HTAPs with a substitution degree of >1.0 were soluble in aqueous solutions and dispersible in organic solvents. Films cast from methanolic solutions of HTAPs exhibited humidity-sensitive reversible hygroscopicity, with their appearance changing from opaque to transparent depending on the environmental humidity. In addition, the films exhibited an extended release of methanol-soluble phenolphthalein when immersed in an aqueous solution. Scanning electron microscopy and scanning probe microcopy observations revealed that the HTAPs formed nanofibers in methanol, indicating that the cast films comprised nanofibers. Therefore, the moisture absorption/desorption and extended-release phenomena are primarily attributed to the nanofiber-based film structures capable of accommodating water and dye molecules within the interstices of the nanofiber networks.
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